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Editorial Team
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Asked: 2026-06-17T08:04:00+00:00

I’m trying to setup a multi-core solr installation but cannot seem to get the

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I’m trying to setup a multi-core solr installation but cannot seem to get the configuration correct for solr to load the required classes.

The output on running java -jar start.jar includes:

Sep 11, 2012 4:23:16 PM org.apache.solr.core.SolrResourceLoader replaceClassLoader
INFO: Adding 'file:/software/solr/solr/contrib/analysis-extras/lib/icu4j-4.8.1.1.jar' to classloader
Sep 11, 2012 4:23:16 PM org.apache.solr.core.SolrResourceLoader replaceClassLoader
INFO: Adding 'file:/software/solr/solr/contrib/analysis-extras/lucene-libs/lucene-icu-3.6.1.jar' to classloader
Sep 11, 2012 4:23:16 PM org.apache.solr.core.SolrResourceLoader replaceClassLoader
INFO: Adding 'file:/software/solr/solr/contrib/analysis-extras/lucene-libs/lucene-smartcn-3.6.1.jar' to classloader
Sep 11, 2012 4:23:16 PM org.apache.solr.core.SolrResourceLoader replaceClassLoader
INFO: Adding 'file:/software/solr/solr/contrib/analysis-extras/lucene-libs/lucene-stempel-3.6.1.jar' to classloader
Sep 11, 2012 4:23:16 PM org.apache.solr.core.SolrConfig <init>
WARNING: <indexDefaults> and <mainIndex> configuration sections are deprecated (but still work). Please use <indexConfig> instead.
Sep 11, 2012 4:23:16 PM org.apache.solr.core.SolrConfig <init>
INFO: Using Lucene MatchVersion: LUCENE_36
Sep 11, 2012 4:23:16 PM org.apache.solr.core.SolrConfig <init>
INFO: Loaded SolrConfig: solrconfig.xml
Sep 11, 2012 4:23:16 PM org.apache.solr.schema.IndexSchema readSchema
INFO: Reading Solr Schema
... snip ...
Sep 11, 2012 4:23:16 PM org.apache.solr.common.SolrException log
SEVERE: java.lang.NoClassDefFoundError: org/apache/lucene/analysis/icu/ICUFoldingFilter
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:247)
    at org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:388)
    at org.apache.solr.core.SolrResourceLoader.newInstance(SolrResourceLoader.java:409)
    at org.apache.solr.util.plugin.AbstractPluginLoader.create(AbstractPluginLoader.java:83)

org/apache/lucene/analysis/icu/ICUFoldingFactory exists in lucene-icu-3.6.1.jar so why is it not found later on?

My directory structure is:

|-solr
|---contrib
|-----analysis-extras
|-------lib
|-------lucene-libs
|-----velocity
|-------lib
|---cores
|-----core0
|-------conf
|-------data
|---------index
|-----core1
|-------conf
|-------data
|-----core2
|-------conf
|-------data
|---------index
|---lib
|-----solrj-lib
|-------optional
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1 Answer

  1. Editorial Team

    I found that I needed to put the following jars in each instance directory’s lib:

    apache-solr-analysis-extras-3.6.2.jar
    lucene-icu-3.6.2.jar
    lucene-stempel-3.6.2.jar
    icu4j-4.8.1.1.jar
    lucene-smartcn-3.6.2.jar
    normalizer.jar
    UnicodeNormalizeFilter.jar

    My main problem was that I didn’t realize that I needed apache-solr-analysis-extras-x.y.x.jar. That file is in apache-solr-3.6.2/dist. The next 4 are from apache-solr-3.6.2/contrib/analysis-extras. (I sort of think that normalizer.jar and UnicodeNormalizerFilter.jar are not need.)

    Then in the schema.xml I needed to use: 

      <filter class="solr.ICUFoldingFilterFactory"/>

    …not the org.apache.lucene.etc package name. I tried that org.apache.lucene.analysis package name and it didn’t work. I found that sort of odd but it is how it looks in the documentation. http://wiki.apache.org/solr/AnalyzersTokenizersTokenFilters#solr.ICUTokenizerFactory

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